Super unleaded gas for 3.6 liter

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Stac0608

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I’m hearing the issues with the 3.6 liter engine in the JL could be remedied by using super unleaded gasoline. That high build up of carbon could be the issue. Back in the day (1986) I never used anything other than super in my CJ7 and the engine ran quiet even with 158,000 miles.
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I’m hearing the issues with the 3.6 liter engine in the JL
What issues?

I have the 3.6 in my '20 JLU and use regular unleaded only. No issues in just over a year of ownership.

I had the 3.6 in my JKU and used unleaded only, and had no issues in the 5 years I owned the vehicle.
 
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Stac0608

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What issues?

I have the 3.6 in my '20 JLU and use regular unleaded only. No issues in just over a year of ownership.

I had the 3.6 in my JKU and used unleaded only, and had no issues in the 5 years I owned the vehicle.
There some engine issues with the engine. Valve and rocker arm bearings so I hear.
 

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There some engine issues with the engine. Valve and rocker arm bearings so I hear.
Never heard of this, sorry.

The 3.6 Pentastar engine is used in multiple Stellantis/FCA/Jeep vehicles. If there was an issue with this engine, it would be affecting more than just the Wrangler.

My wife even has one in her Grand Cherokee without any issues whatsoever.
 

Ridgway Jeeper

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Some people go out of their way to seek what is know as "top tier" gas and maybe that has some benefits. Maybe that is just paid promotion too, I haven't ever looked into it. I am pretty sure it states right in the manual, and the general consensus previously has been that there is no advantage to running premium in the 3.6, or any other engine not requiring premium.

The manual states 87, Most places that is regular. In the mountains at altitude 87 is mid grade and even though the Jeep would likely run fine on it up here we do use 87 (mid grade here) as listed in the manual. The 3.6 runs great on it, haven't had any bad noises of performance issues. I can't see any reason to run premium, just a waste of money IMO.
 

Ridgway Jeeper

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There some engine issues with the engine. Valve and rocker arm bearings so I hear.
Co-worker of mine has a rocker issues on a 15 JKUR with the 3.6. Impossible this is a fuel issue though. The 3.6 is port injected and not really subject to valve deposits like many direct injected engines. The 3.6 has been around a while and is in tons of vehicles besides Jeeps. I have never seen any fuel related problems with them in my readings. There is one thread where somebody insists the high compression 3.6 "pings" but even on 87 lugging it with the manual trans, I haven't heard it.
 
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Stac0608

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Co-worker of mine has a rocker issues on a 15 JKUR with the 3.6. Impossible this is a fuel issue though. The 3.6 is port injected and not really subject to valve deposits like many direct injected engines. The 3.6 has been around a while and is in tons of vehicles besides Jeeps. I have never seen any fuel related problems with them in my readings. There is one thread where somebody insists the high compression 3.6 "pings" but even on 87 lugging it with the manual trans, I haven't heard it.
Didn’t say it was a fuel issue, more like a carbon issue. Lots of vehicles require high octane fuels. It’s even rumored Jeep has suggested super unleaded fuel.
 

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As long as it’s a Tier 1 fuel company with their better fuel additives, you shouldn’t have carbon buildup issues.

As to octane and performance, if you were towing or using it in high heat, 89 octane closer to sea level might be of benefit in performance.
 
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Stac0608

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As long as it’s a Tier 1 fuel company with their better fuel additives, you shouldn’t have carbon buildup issues.

As to octane and performance, if you were towing or using it in high heat, 89 octane closer to sea level might be of benefit in performance.
Carbon build is common with 87 octane fuels.
 

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There some engine issues with the engine. Valve and rocker arm bearings so I hear.
3.6 Owner here and I have been using Regular since I got my 2020 JLUR in Sept 2019. Have seen no issues at all and am also unaware of anyone else having this issue.
 
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Stac0608

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Carbon build is common with 87 octane fuels.
Chrysler Jeep also mentioned 87 fuel could create uneven explosive and detonation in the engine which could damage piston, piston rings, valves, head gasket etc.
 

DadJokes

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Carbon build is common with 87 octane fuels.
That’s not always the case. “Excessive” carbon buildup is from an incomplete burn from a multitude of reasons.
 
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Stac0608

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3.6 Owner here and I have been using Regular since I got my 2020 JLUR in Sept 2019. Have seen no issues at all and am also unaware of anyone else having this issue.
The internet is full of complaints with this engine. Just look at what mechanics are saying. Use super unleaded.
 

631_Islander

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Carbon build is common with 87 octane fuels.
This is news to me. I have been driving since I turned 18 in 2005 and have used Regular on a variety of vehicles (a 1990 Nissan Stanza, a 97 Ford Taurus, 04 Nissan Sentra, 08 Nissan Altima, 09 Honda Civic and a 2020 JLUR). I still have the last 3 on that list in my family and they all run perfectly fine. Never had an issue with Carbon buildup. However I always get my gas from either BP, Mobil, Shell, Sunoco or Gulf. I avoid Mom/Pop Gas Stations as much as possible.
 
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